4.23. A 320-kVA, 240/4800-V, 60-Hz transformer yielded the following infor- mation when tested: Transformers Voltage (V) Current (A) Power (W) Open-circuit test: 240 39.5 1200 Short-circuit test: 195 66.67 3925 Find the equivalent circuit of the transformer as viewed from (a) the low- voltage side and (b) the high-voltage side.

4.23. A 320-kVA, 240/4800-V, 60-Hz transformer yielded the following infor- mation when tested: Transformers Voltage (V) Current (A) Power (W) Open-circuit test: 240 39.5 1200 Short-circuit test: 195 66.67 3925 Find the equivalent circuit of the transformer as viewed from (a) the low- voltage side and (b) the high-voltage side.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Example 1: A single-phase, 100-kVA, 1000:100-V, 60-Hz transformer has the following test results: Open-circuit test (HV side open): 100 V, 6 A, 400 W Short-circuit test (LV side shorted): 50 V, 100 A, 1800 W 1. Draw equivalent circuit of the transformer referred to the high-voltage side. Label impedances numerically in ohms and in per unit. 2. Determine the voltage regulation at rated secondary current with 0.6 power factor lagging. Assume the primary is supplied with rated voltage 3. Determine the efficiency of the transformer when the secondary current is 75% of its rated value and the power factor at the load is 0.8 lagging with a secondary voltage of 98 V across the load